Reverse a String using Recursion

/*
Write a program in C for reverse a string using recursion
*/

#include<stdio.h>
#include<string.h>

void reverse(char*,int,int);

main()
{
char a[100];

gets(a);

reverse(a, 0, strlen(a)-1);

printf("%s\n",a);

return 0;
}

void reverse(char *x, int beg, int end)
{
char a, b, c;

if ( beg >= end )
return;

c = *(x+beg);
*(x+beg) = *(x+end);
*(x+end) = c;

reverse(x, ++beg, --end);
}